*Product Life Cycle - Opportunities for Digital and Sustainable Transformation*

#### **Figure 7.**

*Centerless polishing machine to polish cylindrical SUS310 molding die surfaces. (a) 3D model of Centerless polishing machine. (b) Polishng method on the machine. (c) Overview of Centerless polishing machine.*

designed maximum size for this machine is 200 mm diameter and 200 mm length. By using lifting system and 1 axis robot set up at behind and upside of workpieces, height of polishing parts are able to adjust for each size molding dies.

The centerless polishing machine was manufactured with aluminum pipe frames, as shown in **Figure 7(c)**. Sizes of this machine are 700 x 450 x 500 mm, workpiece rotary drive motor is designed for over 25 kg weight workpieces. The SUS310S molding dies of 50 mm diameter used in slumping process were manufactured by this machine.
